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Welcome to STM
Heart of STM Slipper Clutch
Primary Spring
• pressure action on the DISC PACK through the pressure plate.
• function of coil springs.

Secondary spring
• pressure action on the DRUM;
• it is used to adjust the opening of the clutch during the anti-skid, then to adjust the engine brake.

How springs work
The primary and secondary springs are mounted in such a way as to guarantee a preload which generates an initial resilient spring force.

How the primary spring works
When the lever is actuated, the preloading position of the primary spring is varied and reduced. The spring returns an elastic force of contrast to the action of the lever.

How the secondary spring works
The torque generated by the rear wheel tends to raise the drum. The secondary spring is compressed with respect to the initial resting position and generates an elastic contrast force.

Welcome to STM

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Technical assistance

Our staff is available to help you and assist you in your purchases or after-sales.

Highly qualified staff

Technicians with years of experience will advise you in your purchases and installation of the product.

High reliability

Our products are guaranteed and produced entirely in Italy.